Glutathione production enhancer, prophylactic/therapeutic agent for diseases caused by glutathione deficiency, and food, beverage and feed
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preparation example 1
[0064]Herein, 10 L of water were added to 10 kg of crushed chips of licorice (Glycyrrhiza glabra) rhizomes, and extraction was carried out under gentle stirring, followed by solid-liquid separation by decantation, to yield a liquid extract. The obtained liquid extract was concentrated under vacuum to a paste-like consistency, after which 10 volumes of a 70 vol % ethanol-water solution were added to the obtained concentrate, and the whole was dispersed using a stirrer. The dispersion was kept at 5° C. overnight, the resulting precipitate was removed by suction-filtering using filter paper, and the ethanol-water solution was evaporated from the filtrate under reduced pressure.
[0065]Water was added to the residue thus obtained, to a solids fraction of 5%, and the whole was passed, at SV=1, through a column packed with 10 L of a porous synthetic adsorption resin (Diaion HP-20, by Mitsubishi Chemical). The column was washed with 50 L of water, and then 50 L of an 80 vol % ethanol-water s...
preparation example 2
[0073]Herein, 410 g of a yellow-brown powder (sample 2) were obtained in the same way as in Example 1, but in this case there were added 10 L of 3% aqueous ammonia to 10 kg of crushed chips of licorice (Glycyrrhiza uralensis) rhizomes. The obtained powder was analyzed by high performance liquid chromatography in the same way as in Example 1. The results were glycyrrhizic acid content 0.9 wt %, liquiritin content 5.5 wt %, isoliquiritin content 4.6 wt %, liquiritigenin content 3.9 wt %, isoliquiritigenin content 3.5 wt %.
preparation example 3
[0074]Herein, 10 L of water were added to 10 kg of crushed chips of licorice (Glycyrrhiza inflata) rhizomes, and extraction was carried out under gentle stirring, followed by solid-liquid separation by decantation, to yield a liquid extract. The pH of the obtained liquid extract was adjusted to 2 through addition of 50% sulfuric acid, under stirring, to carry out an acid precipitation treatment. The precipitate was filtered and collected. Water was added to the obtained precipitate, and the whole was dispersed under stirring and was left to stand, after which the supernatant was removed by decantation. The above operation was repeated to remove the sulfuric acid, after which a precipitate was obtained through filtering.
[0075]Next, 5 L of 90 vol % ethanol were added to the precipitate thus obtained, and the whole was dispersed through stirring for 1 hour at normal temperature, followed by suction-filtering using diatomaceous earth. Aqueous ammonia was added to the obtained filtrate t...
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